Question

Chapter : Statistics

Answer fast!

( No need of spam answers )​

Answer 1

Answer

The class marks will be:

10, 30, 50, 70, 90, 110

Frequencies:

10, f, 7, 6, 5, 4

Mean: 46

Mean = $\tt{\frac{\Sigma f_{i} x_{i}}{\Sigma f_{i}}}$

=> 46 = $\tt{\frac{100 + 30f + 350 + 420 + 450 + 440}{10+f+7+6+5+4}}$

=> 46 = $\tt{\frac{1760+30f}{32+f}}$

=> 1472 + 46f = 1760 + 30f

=> 16f = 288

=> f = 18